120 Graphs, 90 New Papers
It was four months ago that an article entitled 80 Graphs From 58 New (2017) Papers Invalidate Claims Of Unprecedented Global-Scale Modern Warming appeared on this website. The article received international attention and was “shared” tens of thousands of times.
In the last 4 months, 40 more graphs taken from 30 more new peer-reviewed scientific papers have made their way into the ever-growing volume of evidence that today’s climate is only not unprecedented or unusual in the context of the last millennium, but modern temperature values are still among the coldest of the last 10,000 years.
In other words, there is nothing unprecedented or unusual about today’s climate. Modern temperatures are still well within the range of what has occurred naturally.
The roughly 3 dozen papers and graphs that have appeared in the scientific literature since the original list appeared 4 months ago are shown below.
The full list of 120 graphs from 90 new papers for 2017 can be found here:
A few late Northern Hemisphere additions to the 2016 volume can also be found below, as well as some recent additions to the list of 350 papers taken from the Ljungqvist (2010) Northern Hemisphere conglomeration.
“By wavelet analysis, a new proof has been provided that at least the ~190-year climate cycle has a solar origin. … G7 [global temperature over the last 2000 years], and likewise the sine representations have maxima of comparable size at AD 0, 1000, and 2000. We note that the temperature increase of the late 19th and 20th century is represented by the harmonic temperature representation, and thus is of pure multiperiodic nature. It can be expected that the periodicity of G7, lasting 2000 years so far, will persist also for the foreseeable future. It predicts a temperature drop from present to AD 2050, a slight rise from 2050 to 2130, and a further drop from AD 2130 to 2200.”
The proxy measurements suggest New Zealand’s climate has fluctuated within a band of approximately 2°C since at least 900 AD, as shown in Figure 2. The warming of nearly 1°C since 1940 falls within this band. The discrepancy between the orange and blue lines in recent decades as shown in Figure 3, suggests that the anthropogenic contribution to this warming [1°C since 1940] could be in the order of approximately 0.2°C. [80% of the warming since 1940 may be due natural factors]. … [T]he increases in temperature over the last 100 years can be largely attributed to natural phenomena.
“The summer (June through August) temperature reconstruction, extending back to 1038 CE, exhibits three warm periods in 1040–1190 CE, 1370–1570 CE and the 20th century and one extended cold period between 1570 and 1920 CE.”
“In the center of Australia, all the stations available in a circle of radius 1,000 km were showing very little or no warming, as still acknowledged in the GHCN v2 data set up to October 2011 (Fig. 6). … Table 1 presents the warming trend for the 30 longest temperature records of Australia collected in a single location, with measurements started before 1900 and continued until after 1985. … In the 30 locations, the monthly mean maximum temperature is warming 0.0004°C/year, or0.04°C/century. That means there is no change within the limits of accuracy of the measurements.“
“This paper presents new high-resolution proxies and paleoclimatic reconstructions for studying climate changes in China for the past 2000 years. Multi-proxy synthesized reconstructions show that temperature variation in China has exhibited significant 50–70-yr, 100–120-yr, and 200–250-yr cycles. Results also show that the amplitudes of decadal and centennial temperature variation were 1.3◦C and 0.7◦C, respectively, with the latter significantly correlated with long-term changes in solar radiation, especially cold periods, which correspond approximately to sunspot minima. The most rapid warming in China occurred over AD 1870–2000, at a rate of 0.56◦ ± 0.42◦C (100 yr)−1; however, temperatures recorded in the 20th century may not be unprecedented for the last 2000 years, as data show records for the periods AD 981–1100 and AD 1201–70 are comparable to the present.”
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